hi, I am in the process of doing a brake upgrade on my TA22. I am using BMW E30 disks with Series 4 Mazda RX7 4 pot callipers. I am getting a braket machined in order to mount the callipers as they have differently spaced mounting holes, and a spacer for the hub. I am getting the disks drilled for my stud pattern as well. I am getting the braket made up soon and I can let you know the dimensions if you like.